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jode/jode/jode/type/Type.java

482 lines
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/* Type Copyright (C) 1998-1999 Jochen Hoenicke.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package jode;
import jode.bytecode.ClassInfo;
///#ifdef JDK12
///import java.lang.ref.WeakReference;
///import java.lang.ref.ReferenceQueue;
///import java.util.Map;
///import java.util.HashMap;
///#else
import java.util.Hashtable;
///#endif
/**
* This is my type class. It differs from java.lang.class, in
* that it maintains a type range. This type range may be implicit or
* explicit. <br>
*
*
* Think of this global type hierarchie:
* <pre>
*
* tUnknown
* / | \
* / | \
* tObject boolean int
* / \ / \
* / tArray short char
* other |
* classes byte
* </pre>
*
* int implements the "interface" tBoolInt. boolean and byte
* implement the "interface" tBoolByte which extends tBoolInt. <br>
*
* The type tBoolInt is <tBoolInt, tUnknown>, the type tBoolByte is
* <tBoolByte, tUnknown> (hard coded in <code>getTop</code>). The
* type tUInt is <int, byte>. <br>
*
* Note that tUnknown is no valid type, so we can replace
* <tUnknown, byte> with <int, byte>
* <tUnknown, tArray> with <tObject, tArray>, <br>
*
* Arrays extend Object and implement java.lang.Cloneable and
* java.io.Serializable, as defined in jls.
*
* The main operation on a type range is the intersection. To do this
* on class ranges we need three more operations: specialization,
* generalization and createRange. <p>
*
* specialization chooses the common sub type of the two types. It
* is used to find the start point of the intersected interval. <p>
*
* generalization chooses the common super type of two types. It
* is used to find the end point of the intersected interval. <p>
*
* When the new interval is created with <code>createRangeType</code>
* the start and end points are adjusted so that they only consists of
* possible types.
*
* @author Jochen Hoenicke */
public class Type {
public static final int TC_BOOLEAN = 0;
public static final int TC_BYTE = 1;
public static final int TC_CHAR = 2;
public static final int TC_SHORT = 3;
public static final int TC_INT = 4;
public static final int TC_LONG = 5;
public static final int TC_FLOAT = 6;
public static final int TC_DOUBLE = 7;
public static final int TC_NULL = 8;
public static final int TC_ARRAY = 9;
public static final int TC_CLASS = 10;
public static final int TC_VOID = 11;
public static final int TC_METHOD = 12;
public static final int TC_ERROR = 13;
public static final int TC_UNKNOWN = 101;
public static final int TC_RANGE = 103;
public static final int TC_INTEGER = 107;
protected static JodeEnvironment env;
///#ifdef JDK12
/// private static final Map classHash = new HashMap();
/// private static final ReferenceQueue classQueue = new ReferenceQueue();
/// private static final Map arrayHash = new HashMap();
/// private static final ReferenceQueue arrayQueue = new ReferenceQueue();
/// private static final Map methodHash = new HashMap();
/// private static final ReferenceQueue methodQueue = new ReferenceQueue();
///#else
private static final Hashtable classHash = new Hashtable();
private static final Hashtable arrayHash = new Hashtable();
private static final Hashtable methodHash = new Hashtable();
///#endif
public static final Type tBoolean = new IntegerType(IntegerType.IT_Z);
public static final Type tByte = new IntegerType(IntegerType.IT_B);
public static final Type tChar = new IntegerType(IntegerType.IT_C);
public static final Type tShort = new IntegerType(IntegerType.IT_S);
public static final Type tInt = new IntegerType(IntegerType.IT_I);
public static final Type tLong = new Type(TC_LONG);
public static final Type tFloat = new Type(TC_FLOAT);
public static final Type tDouble = new Type(TC_DOUBLE);
public static final Type tVoid = new Type(TC_VOID);
public static final Type tError = new Type(TC_ERROR);
public static final Type tUnknown = new Type(TC_UNKNOWN);
public static final Type tUInt = new IntegerType(IntegerType.IT_I
| IntegerType.IT_B
| IntegerType.IT_C
| IntegerType.IT_S);
public static final Type tBoolInt = new IntegerType(IntegerType.IT_I
| IntegerType.IT_Z);
public static final Type tBoolUInt= new IntegerType(IntegerType.IT_I
| IntegerType.IT_B
| IntegerType.IT_C
| IntegerType.IT_S
| IntegerType.IT_Z);
public static final Type tBoolByte= new IntegerType(IntegerType.IT_B
| IntegerType.IT_Z);
public static final ClassInterfacesType tObject =
tClass("java.lang.Object");
public static final ReferenceType tNull = new NullType();
public static final Type tUObject = tRange(tObject, tNull);
public static final Type tString = tClass("java.lang.String");
public static final Type tStringBuffer = tClass("java.lang.StringBuffer");
public static final Type tJavaLangClass = tClass("java.lang.Class");
public static final Type tType(Class javaType) {
if (javaType.isPrimitive()) {
if (javaType == Boolean.TYPE)
return Type.tBoolean;
else if (javaType == Byte.TYPE)
return Type.tByte;
else if (javaType == Character.TYPE)
return Type.tChar;
else if (javaType == Short.TYPE)
return Type.tShort;
else if (javaType == Integer.TYPE)
return Type.tInt;
else if (javaType == Long.TYPE)
return Type.tLong;
else if (javaType == Float.TYPE)
return Type.tFloat;
else if (javaType == Double.TYPE)
return Type.tDouble;
else if (javaType == Void.TYPE)
return Type.tVoid;
else
throw new AssertError("Unknown primitive type: "+javaType);
} else if (javaType.isArray()) {
return tArray(tType(javaType.getComponentType()));
} else {
return tClass(javaType.getName());
}
}
public static final Type tType(String type) {
if (type == null || type.length() == 0)
return tError;
switch(type.charAt(0)) {
case 'Z':
return tBoolean;
case 'B':
return tByte;
case 'C':
return tChar;
case 'S':
return tShort;
case 'I':
return tInt;
case 'F':
return tFloat;
case 'J':
return tLong;
case 'D':
return tDouble;
case 'V':
return tVoid;
case '[':
return tArray(tType(type.substring(1)));
case 'L':
int index = type.indexOf(';');
if (index != type.length()-1)
return tError;
return tClass(type.substring(1, index));
case '(':
return tMethod(type);
}
throw new AssertError("Unknown type signature: "+type);
}
public static final ClassInterfacesType tClass(String clazzname) {
return tClass(ClassInfo.forName(clazzname.replace('/','.')));
}
public static final ClassInterfacesType tClass(ClassInfo clazzinfo) {
///#ifdef JDK12
/// java.lang.ref.Reference died;
/// while ((died = classQueue.poll()) != null)
/// classHash.values().remove(died);
/// WeakReference ref = (WeakReference) classHash.get(clazzinfo);
/// Object result = (ref == null) ? null : ref.get();
///#else
Object result = classHash.get(clazzinfo);
///#endif
if (result == null) {
result = new ClassInterfacesType(clazzinfo);
///#ifdef JDK12
/// classHash.put(clazzinfo, new WeakReference(result, classQueue));
///#else
classHash.put(clazzinfo, result);
///#endif
}
return (ClassInterfacesType) result;
}
public static final Type tArray(Type type) {
if (type == tError)
return type;
///#ifdef JDK12
/// java.lang.ref.Reference died;
/// while ((died = arrayQueue.poll()) != null)
/// arrayHash.values().remove(died);
/// WeakReference ref = (WeakReference) arrayHash.get(type);
/// Type result = (ref == null) ? null : (Type) ref.get();
///#else
Type result = (Type) arrayHash.get(type);
///#endif
if (result == null) {
result = new ArrayType(type);
///#ifdef JDK12
/// arrayHash.put(type, new WeakReference(result, arrayQueue));
///#else
arrayHash.put(type, result);
///#endif
}
return result;
}
public static final MethodType tMethod(String signature) {
///#ifdef JDK12
/// java.lang.ref.Reference died;
/// while ((died = methodQueue.poll()) != null)
/// methodHash.values().remove(died);
/// WeakReference ref = (WeakReference) methodHash.get(signature);
/// MethodType result = (ref == null) ? null : (MethodType) ref.get();
///#else
MethodType result = (MethodType) methodHash.get(signature);
///#endif
if (result == null) {
result = new MethodType(signature);
///#ifdef JDK12
/// methodHash.put(signature, new WeakReference(result, methodQueue));
///#else
methodHash.put(signature, result);
///#endif
}
return result;
}
public static final Type tRange(ReferenceType bottom,
ReferenceType top) {
return new RangeType(bottom, top);
}
public static Type tSuperType(Type type) {
return type.getSuperType();
}
public static Type tSubType(Type type) {
return type.getSubType();
}
public static Type tClassOrArray(String ident) {
if (ident.charAt(0) == '[')
return Type.tType(ident);
else
return Type.tClass(ident);
}
public static void setEnvironment(JodeEnvironment e) {
env = e;
}
final int typecode;
/**
* Create a new type with the given type code.
*/
protected Type(int typecode) {
this.typecode = typecode;
}
public Type getSubType() {
return this;
}
public Type getSuperType() {
return this;
}
// public Type getBottom() {
// return this;
// }
// public Type getTop() {
// return this;
// }
public Type getHint() {
return this;
}
/**
* @return the type code of the type.
*/
public final int getTypeCode() {
return typecode;
}
public int stackSize()
{
switch(typecode) {
case TC_VOID:
return 0;
case TC_ERROR:
default:
return 1;
case TC_DOUBLE:
case TC_LONG:
return 2;
}
}
/**
* Intersect this type with another type and return the new type.
* @param type the other type.
* @return the intersection, or tError, if a type conflict happens.
*/
public Type intersection(Type type) {
if (this == tError || type == tError)
return tError;
if (this == tUnknown)
return type;
if (type == tUnknown || this == type)
return this;
if (Decompiler.isTypeDebugging)
Decompiler.err.println("intersecting "+ this +" and "+ type
+ " to <error>");
return tError;
}
/**
* Checks if we need to cast to a middle type, before we can cast from
* fromType to this type.
* @return the middle type, or null if it is not necessary.
*/
public Type getCastHelper(Type fromType) {
return null;
}
/**
* Checks if this type represents a valid type instead of a list
* of minimum types.
*/
public boolean isValidType() {
return typecode <= TC_DOUBLE;
}
/**
* Checks if this type represents a class or an array of a class
*/
public boolean isClassType() {
return false;
}
/**
* Check if this and &lt;unknown -- type&rt; are not disjunct.
* @param type a simple type; this mustn't be a range type.
* @return true if this is the case.
*/
public boolean isOfType(Type type) {
return this.intersection(type) != Type.tError;
}
/**
* Marks this type as used, so that the class is imported.
*/
public void useType() {
/* No action needed for simple types */
}
public String getDefaultName() {
switch (typecode) {
case TC_LONG:
return "l";
case TC_FLOAT:
return "f";
case TC_DOUBLE:
return "d";
default:
return "local";
}
}
public Object getDefaultValue() {
switch (typecode) {
case TC_LONG:
return new Long(0);
case TC_FLOAT:
return new Float(0);
case TC_DOUBLE:
return new Double(0);
default:
return null;
}
}
public String getTypeSignature() {
switch (typecode) {
case TC_LONG:
return "J";
case TC_FLOAT:
return "F";
case TC_DOUBLE:
return "D";
default:
return "?";
}
}
public Class getTypeClass() throws ClassNotFoundException {
switch (typecode) {
case TC_LONG:
return Long.TYPE;
case TC_FLOAT:
return Float.TYPE;
case TC_DOUBLE:
return Double.TYPE;
default:
throw new AssertError("getTypeClass() called on illegal type");
}
}
public String toString() {
switch (typecode) {
case TC_LONG:
return "long";
case TC_FLOAT:
return "float";
case TC_DOUBLE:
return "double";
case TC_NULL:
return "null";
case TC_VOID:
return "void";
case TC_UNKNOWN:
return "<unknown>";
case TC_ERROR:
default:
return "<error>";
}
}
}